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I know what the /etc/group file is for, but I'm also seeing a /etc/group- file. What's the difference between the two?

The same group names and ids appear in both files. Only the last column (users) is different.

I'm running ubuntu 11.04

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up vote 5 down vote accepted

Though I cannot find any information in manual pages, I suppose it is a backup copy, as it is documented for /etc/shadow- in shadow manual page:

/etc/shadow-
       Backup file for /etc/shadow.
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